Questions from College Physics

Q: Bruce is trying to remove an eyelash from the surface of his

Bruce is trying to remove an eyelash from the surface of his eye. He looks in a shaving mirror to locate the eyelash, which is 0.40 cm long. If the focal length of the mirror is 18 cm and he puts his...

Q: Simon wishes to display a double-slit experiment for his class

Simon wishes to display a double-slit experiment for his class. His coherent light source has a wavelength of 510 nm, and the slit separation is d = 0.032 mm. He must set up the light on a desk 1.5 m...

Q: The speed of waves on a lake depends on frequency. For

The speed of waves on a lake depends on frequency. For waves of frequency 1.0 Hz, the wave speed is 1.56 m/s; for 2.0 Hz waves, the speed is 0.78 m/s. The 2.0 Hz waves from a speedboat's wake reach yo...

Q: (a) What is the density of an object that is

(a) What is the density of an object that is 14% submerged when floating in water at 0°C? (b) What percentage of the object will be submerged if it is placed in ethanol at 0°C?

Q: Two strings, each 15.0 m long, are stretched

Two strings, each 15.0 m long, are stretched side by side. One string has a mass of 78.0 g and a tension of 180.0 N. The second string has a mass of 58.0 g and a tension of 160.0 N. A pulse is generat...

Q: A fellow student says that there is never an electric field inside

A fellow student says that there is never an electric field inside a conductor. Do you agree? Explain.

Q: Explain why electric field lines never cross.

Explain why electric field lines never cross.

Q: You are given two x-ray tubes, A and B

You are given two x-ray tubes, A and B. In tube A, electrons are accelerated through a potential difference of 10 kV. In tube B, the electrons are accelerated through 40 kV. What is the ratio of the m...

Q: A truck carrying explosive gases either has chains or straps that drag

A truck carrying explosive gases either has chains or straps that drag along the ground, or else it has special tires that conduct electricity (ordinary tires are good insulators). Explain why the cha...

Q: In tall buildings, the water supply system uses multiple pumping stations

In tall buildings, the water supply system uses multiple pumping stations on different floors. At each station, water pumped up from below collects in a storage tank held at atmospheric pressure befor...